Title :
A new model for calculating the input impedance of coax-fed circular microstrip antennas with and without air gaps
Author :
Abboud, F. ; Damiano, J.P. ; Papiernik, A.
Author_Institution :
Lab. d´´Electron. Nice Univ., Sophia Antipolis, France
fDate :
11/1/1990 12:00:00 AM
Abstract :
A model is presented for calculating the input impedance of a probe-fed circular antenna with and without air gaps between the substrate and the ground plane. It is based on the cavity method, the dynamic permittivity constant (to take into account the influence of the fringing field at the edge of radiating element), and the resonant parallel R-L-C circuit with an inductive reactance. Numerical results are shown to agree well with experimental ones. The model is well suited for computer-aided design
Keywords :
antenna feeders; antenna theory; electric impedance; microstrip antennas; air gaps; cavity method; coax-fed circular microstrip antennas; computer-aided design; dynamic permittivity constant; fringing field; ground plane; inductive reactance; input impedance; model; numerical results; probe-fed circular antenna; radiating element; resonant parallel R-L-C circuit; substrate; Air gaps; Capacitance; Coaxial components; Dielectric substrates; Impedance; Microstrip antennas; Permittivity; RLC circuits; Resonance; Resonant frequency;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
